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  • Adding rows to a data-bound DataGridView [Winforms]

    - by Mishko
    I want to bind a table from a database to a DataGridView, but I want to also add one more row with a sum of the values in the columns with indexes 3,4,7,8,9... How can I do that? Thanks! DataTable table1 = new DataTable(); double brutoUkupno1 = 0; double porezUkupno1 = 0; double doprinosUkupno1 = 0; double netoUkupno1 = 0; double doprinosTeretUkupno1 = 0; double topliObrokUkupno1 = 0; double regresUkupno1 = 0; Connection con = new Connection(); table1 = con.boundTable(month, Convert.ToInt32(year)); //This is method which returns DataTable table1.Rows.Add(null, null, null, null, null, null, null, null, null, null, null, null, null, null); table1.Rows.Add(null, null, null, null, null, null, null, null, null, null, null, null, null, null); dgv2.Visible = true; dgv2.DataSource = table1; for (int i = 0; i < dgv2.RowCount - 2; i++) { topliObrokUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[7].Value); regresUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[8].Value); brutoUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[9].Value); porezUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[10].Value); doprinosUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[11].Value); netoUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[12].Value); doprinosTeretUkupno1 += Convert.ToDouble(dgv2.Rows[i].Cells[13].Value); //Now I am having problems with this below, putting things above to dgv2 : } dgv2.Rows[dgv2.Rows.Count - 1].Cells[0].Value = "Ukupno"; dgv2.Rows[dgv2.Rows.Count - 1].Cells[3].Value = month.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[4].Value = year.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[7].Value = topliObrokUkupno1.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[8].Value = regresUkupno1.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[9].Value = brutoUkupno1.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[10].Value = porezUkupno1.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[11].Value = doprinosUkupno1.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[12].Value = netoUkupno1.ToString(); dgv2.Rows[dgv2.Rows.Count - 1].Cells[13].Value = doprinosTeretUkupno1.ToString(); dgv2.Rows[dgv2.RowCount - 2].Height = 3; dgv2.Rows[dgv2.RowCount - 2].DefaultCellStyle.BackColor = Color.Black;

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  • Displaying FontFamily in Combobox

    - by Torsten
    Hi. My goal is to manipulate the text-styles of my application via DependencyProperties. I got a diagram in which the texts are to be manipulated in size, fontfamily, color, etc. So I'd like to use an interface similar to a rich text editor like Word. I'm using this code in my TextStyleVM http://shevaspace.blogspot.com/2006/12/i-have-some-fun-with-formattedtext_14.html So I have a FontFamilyProperty and a Getter and Setter for it: public static DependencyProperty FontFamilyProperty = DependencyProperty.Register( "FontFamily", typeof(FontFamily), typeof(OutlinedText), new FrameworkPropertyMetadata( SystemFonts.MessageFontFamily, FrameworkPropertyMetadataOptions.AffectsRender | FrameworkPropertyMetadataOptions.AffectsMeasure), new ValidateValueCallback(IsValidFontFamily)); public FontFamily FontFamily { get { return (FontFamily)base.GetValue(FontFamilyProperty); } set { base.SetValue(FontFamilyProperty, value); } } Then there is a ToStyle method, which sets the style for the labels of the diagram, which are to be manipulated: Style style = new Style(); Binding fontFamilyBinding = new Binding("FontFamily"); fontFamilyBinding.Source = this; Setter fontFamilySetter = new Setter(); fontFamilySetter.Property = TextBlock.FontFamilyProperty; fontFamilySetter.Value = fontFamilyBinding; style.Setters.Add(fontFamilySetter); return style; Now this works for a TextBox. The textbox displays the current FontFamily, and if I enter a new, valid FontFamily like Arial into the textbox the FontFamily of the labels are changed. However, what I'd like to have is a combobox, which displays the SystemFonts and where I can choose one FontFamily for my labels. However, the binding doesn't seem to work. Neither the system fonts nor the current fonts of the labels are displayed. The combobox is just empty. This is my xaml: <r:RibbonLabel Content="FontFamily" /> <!--these do not work--> <r:RibbonComboBox SelectedItem="{Binding FontFamily}"/> <r:RibbonComboBox ItemsSource="{Binding FontFamily}"/> <!--this works--> <r:RibbonTextBox Text="{Binding FontFamily}"/> Now, I assume I have to set a different Setter for a ComboBox in the ToStyle Method. But I have no clue, which one. Maybe someting like this: fontFamilySetter.Property = ComboBox.ItemSource; However, if I set that Property, the TextBox still works. So is this the wrong place to start at? I'd also be grateful if someone could hint me to some documentation about using these Style-, Setter-, Binding-key-words, which are used in the ToStyle method, since this is somebody elses code I'm working with.

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  • ! Extra }, or forgotten \endgroup. latex

    - by gzou
    hey, I met these latex format problem, anyone can offer some help? the .tex file: \begin{table}{} \renewcommand{\arraystretch}{1.1} \caption{Cambridge Flow feature definition and description} \label{cambridge-feature}} \centering \begin{tabular}{|c|c|} \hline\bfseries Abbreviation &\bfseries Description\\ \hline serv-port & Server port\\ \hline clnt-port & Client port\\ \hline push-pkts-serv & count of all packets with\\ & push bit set in TCP header (server to client)\\ \hline init-win-bytes-clnt & the total number of bytes \\ & sent in initial window (client to server)\\ \hline init-win-bytes-serv & the total number of bytes sent\\ & in initial window (server to client)\\ \hline avg-seg-size-clnt & average segment size: \\ & data bytes devided by number of packets\\ \hline IP-bytes-med-clnt & median of total bytes in IP packet\\ \hline act-data-pkt-serv & count of packet with at least one byte \\ & of TCP data playload (server to client)\\ \hline data-bytes-var-clnt & variance of total \\ & bytes in packets (client to server)\\ \hline min-seg-size-serv & minimum segment size \\ & observed (server to client)\\ \hline RTT-samples-serv & total number of RTT samples\\ & found (server to client),\\ & {\bf see also \cite{Moore05discriminators}}\\ \hline push-pkts-clnt & count of all packets with push bit set \\ & in TCP header (server to client)\\ \hline \end{tabular} \end{table} and the error message: ! Extra }, or forgotten \endgroup. \@endfloatbox ...pagefalse \outer@nobreak \egroup \color@endbox l.892 \end{table} I've deleted a group-closing symbol because it seems to be spurious, as in $x}$'. But perhaps the } is legitimate and you forgot something else, as in\hbox{$x}'. In such cases the way to recover is to insert both the forgotten and the deleted material, e.g., by typing `I$}'. there is no $ in my table, also this { are matching with the }, and also after I comment the citation, the error remains. anyone can offer help? really appreciate all the comments! ! Extra }, or forgotten \endgroup.

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  • IE8 positioning, nightmare!

    - by Kyle Sevenoaks
    Well hi, guess what, I have an IE positioning issue! This is in 8, so god know what's going on in the other versions (checking later) Both the boxes call the same class, why is IE being so difficult? Here's how it's meant to look: And here's how it does look: CSS: (removed comments for ease of reading) div .roundbigboxkunde { background-image:url(../../upload/EW_kunde_info.png); background-position:top center; padding:10px; padding-top:10px; padding-bottom:20px; width:560px; height:1%; border-width:1px; border-color:#dddddd; border-radius:10px; -moz-border-radius:10px; -webkit-border-radius:10px; z-index:1; position:relative; overflow:hidden; } div .roundbigboxkundei { margin-top:10px; padding:10px; padding-top:10px; padding-bottom:10px; width:760px; height:1%; position:relative; overflow:hidden; And HTML: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <div class="roundbigboxkunde"> <div class="roundbigboxkundei"> <p id="nyk">&nbsp;</p> <div id="bg_box2"></div> <p class="required"> <label for="billing_firstName"><span class="label">Fornavn:</span></label> <fieldset class="error"><input name="billing_firstName" class="text" type="text" value="Kyle"/> <div class="errorText hidden"></div> </fieldset> </p> CONTENT CONTINUES </fieldset> Here is the page

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  • Visual Web Developer 2008 Express and XHTML 1.1 (not applying)

    - by Mike Valeriano
    Hello. I may be missing something since I'm not used to work with IDEs for web development, so please understand if I'm doing something stupid. I've picked a copy of Beginning ASP.NET 3.5 in C# and VB to try and learn this thing quickly. I'm no HTML guru, but I know something about the DTDs and I want to either use XHTML 1.0 Strict or XHTML 1.1 while learning the ins and outs of ASP.NET. Following the book (just started actually), I'm not having any trouble understanding the concepts, since I have a C# background, but what I don't understand is how VWD goes about applying the schema you select for validation. The book explains that the drop-down list on the toolbar is enough to set this, so that's what I did: I've selected XHTML 1.1 (since there is no 1.0 strict option, what I find really odd) and then started the project. The thing is that the code generated automatically for the Default page had the XHTML 1.0 transitional DTD. Every other page added had the same DTD, even though XHTML 1.1 is still the selected schema in the drop-down list. I decided to test it out and there it was: inserting some text in the design view and then applying a bold formatting just inserted < b tags on the code. Changing color does add a span tag with added CSS though. What I want to know is: if I want strict XHTML (or 1.1) should I just code it manually? Or is there a "fix" for this problem (having a schema selected but not applied by the IDE)? Am I missing something really easy and dumb? I have no problem with coding it manually - I actually prefer doing that. The thing is that I really wanna try this WYSIWYG approach for once, since some developers swear by it. Plus I don't know yet if I'll need special tags for ASP.NET, so I think having them inserted automatically should be the best practice. I couldn't find any similar problems around (MSDN, Google, here), and as far as the book goes (up to the point I've read), this is the expected VWD behavior, which I find suspect at least. Sorry for the long text (and poor English - not my primary language). Thanks in advance for any help/tips.

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  • dhtmlxgrid: getting an xml string of grid data

    - by user823527
    The dhtmlxgrid documentation is saying that I should be able to get a string with the grid data with the serialize feature. mygrid.setSerializationLevel(true,true); var myXmlStr = mygrid.serialize(); I'd like to use that feature to get the updated grid data. But I don't get the xml string. Is that feature not available in the open source version? If I could get a csv string, that would also be OK. But I don't get that either. var gridcsv=mygrid.serializeToCSV(); document.getElementById("mytextareax").value = gridcsv; The html information for the grid is: <a href="#" onclick="savegrid();">Save Grid</a> <textarea id="mytextareax"><rows><row id='r1'><cell>index ... </rows></textarea> <div id="mytextarea" style="width:400px; height: 400px;"> </div> <div id="gridbox" style="width:600px; height:270px; background-color:white;"></div> <a href='#alfa' onClick="ser()">Reload grid with another structure</a> <br> The script for creating the grid is: <script> mygrid = new dhtmlXGridObject('gridbox'); mygrid.setImagePath("../../codebase/imgs/"); mygrid.loadXML("../common/grid500.xml"); function ser(){ mygrid.clearAll(true); mygrid.loadXML("../common/gridH3.xml"); } function savegrid(){ alert('save grid'); mygrid.setSerializationLevel(true,true); var myXmlStr = mygrid.serialize(); /* document.getElementById("mytextarea").innerHTML = myXmlStr; */ document.getElementById("mytextareax").value = myXmlStr; alert(myXmlStr); } </script> Is there any way to get the data out of the dhtmlx grid to be able to create my own xml file from it?

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  • Flex 4 IntelliJ IDEA wrapper html crashes browser

    - by user347641
    I'm building an Flex 4 application using IntelliJ IDEA generated sample Flex application. I replace the mxml with the following code from the book Hello Flex 4. It simply crashes the browser when I run it. I tried it on both FF and Chrome. Any clues? [Bindable] public var _bread:Number = Number.NaN; ]]></fx:Script> <fx:Declarations> <s:RadioButtonGroup id="moralityRBG"/> <s:RadioButtonGroup id="restaurantRBG" selectedValue="{_theory.length % 2 == 0 ? 'smoking' : 'non'}"/> </fx:Declarations> <s:Panel width="100%" height="100%" title="Simple Components!"> <s:layout> <s:HorizontalLayout paddingLeft="5" paddingTop="5"/> </s:layout> <s:VGroup> <s:TextArea id="textArea" width="200" height="50" text="@{_theory}"/> <s:TextInput id="textInput" width="200" text="@{_theory}"/> <s:HSlider id="hSlider" minimum="0" maximum="11" liveDragging="true" width="200" value="@{_bread}"/> <s:VSlider id="vSlider" minimum="0" maximum="11" liveDragging="true" height="50" value="@{_bread}"/> <s:Button label="{_theory}" width="200" color="{alarmTB.selected ? 0xFF0000 : 0}" click="_bread = Math.min(_theory.length, 11)"/> <s:CheckBox id="checkBox" selected="{_bread % 2 == 0}" label="even?"/> </s:VGroup> <s:VGroup> <s:RadioButton label="Good" value="good" group="{moralityRBG}"/> <s:RadioButton label="Evil" value="evil" group="{moralityRBG}"/> <s:RadioButton label="Beyond" value="beyond" group="{moralityRBG}"/> <s:RadioButton label="Smoking" value="smoking" group="{restaurantRBG}"/> <s:RadioButton label="Non-Smoking" value="non" group="{restaurantRBG}"/> <s:ToggleButton id="alarmTB" label="ALARM!"/> <s:NumericStepper id="numericStepper" value="@{_bread}" minimum="0" maximum="11" stepSize="1"/> <s:Spinner id="spinner" value="@{_bread}" minimum="0" maximum="11" stepSize="1"/> </s:VGroup> </s:Panel>

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  • iPhone SDK 3/4 App will not run on a iPhone 2.x device even with deployment target set to 2.0!

    - by MarqueIV
    Ok... I know about the difference between the base/active SDKs and the deployment target. I have my base SDK set at 4.0 and the deployment target set at 2.0. I am not using any APIs post 2.x, conditional or otherwise. Since I can't debug on a 2.x device, after building it, I use the iPhone Configuration Utility to install the app on the device, which it does just fine. Problem is, it doesn't run! I just get a blank screen. The main window never comes up! Now before you ask... I had this same problem with the iPhone SDK 3.x. I upgraded to the 4.x hoping it would be solved. It wasn't. Yes the provisioning profile is installed. (Couldn't install the app if it wasn't.) This same compiled app works fine on 3.x devices. Same with 4.x devices. Just not 2.x devices. Again, no I am not using any post-2.x SDKs. To prove this I created a brand-new, window-based app from the 'New Project' dialog and the only changes I made was the background color of the window (to prove the XIB loaded) and I set the deployment target to 2.0 (It's still compiled against the 4.x SDK though.) Again, it runs fine on 3.x or 4.x devices, but just a black, blank screen on 2.x devices. I've tried this on three separate 2.x devices included one freshly restored. I've used three separate dev machines (MacBook Pro with the 3.x SDK, MacBook Pro with the 4.x SDK and a Mac Pro with the 3.x SDK.) Same result every time. I am stumped. The fact that even an unmodified project doesn't run really has me confused. Could it be the XIB file? Did they change the format from 2.x to something newer in the 3.x SDK? If so, how do I set it back to 2.x. (Again, this is just a complete guess.) But I'm really stumped! Mark

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  • detect face from image and crop face from that photo

    - by Siddhpura Amit
    I have done coding in that i am successfully getting face with rectangle drawing now i want to crop that rectangle area. if there are many rectangle( mean many faces) than user can select one of the face or rectangle and that rectangle areal should be cropped can any body help me... Below is my code class AndroidFaceDetector extends Activity { public String path; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Bundle bundle = this.getIntent().getExtras(); path = bundle.getString("mypath"); setContentView(new myView(this)); } class myView extends View { private int imageWidth, imageHeight; private int numberOfFace = 5; private FaceDetector myFaceDetect; private FaceDetector.Face[] myFace; float myEyesDistance; int numberOfFaceDetected; Bitmap myBitmap; public myView(Context context) { super(context); System.out.println("CONSTRUCTOR"); System.out.println("path = "+path); if (path != null) { BitmapFactory.Options BitmapFactoryOptionsbfo = new BitmapFactory.Options(); BitmapFactoryOptionsbfo.inPreferredConfig = Bitmap.Config.RGB_565; myBitmap = BitmapFactory.decodeFile(path, BitmapFactoryOptionsbfo); imageWidth = myBitmap.getWidth(); imageHeight = myBitmap.getHeight(); myFace = new FaceDetector.Face[numberOfFace]; myFaceDetect = new FaceDetector(imageWidth, imageHeight, numberOfFace); numberOfFaceDetected = myFaceDetect.findFaces(myBitmap, myFace); } else { Toast.makeText(AndroidFaceDetector.this, "Please Try again", Toast.LENGTH_SHORT).show(); } } @Override protected void onDraw(Canvas canvas) { System.out.println("ON DRAW IS CALLED"); if (myBitmap != null) { canvas.drawBitmap(myBitmap, 0, 0, null); Paint myPaint = new Paint(); myPaint.setColor(Color.GREEN); myPaint.setStyle(Paint.Style.STROKE); myPaint.setStrokeWidth(3); for (int i = 0; i < numberOfFaceDetected; i++) { Face face = myFace[i]; PointF myMidPoint = new PointF(); face.getMidPoint(myMidPoint); myEyesDistance = face.eyesDistance(); canvas.drawRect((int) (myMidPoint.x - myEyesDistance), (int) (myMidPoint.y - myEyesDistance), (int) (myMidPoint.x + myEyesDistance), (int) (myMidPoint.y + myEyesDistance), myPaint); } } } } }

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  • Sticky Footer Dilemma - so close

    - by fmz
    I have an effective sticky footer solution, but I have a slight conflict because of the need for a background image in addition to the repeating banner image across the top. In order to make the large watermark type image show up on this site I added the following div: <div id="body-outer"> The only problem is that once I add this div tag, the footer climbs up the page, overriding all content in its path. If I remove that div, the footer is as sticky as one could hope. Is there some way to have the background image and the sticky footer too? Here is the basic html structure: <body class="home"> <div id="body-outer"> <div id="container"> <div id="header"> ... <div id="footer"> <p>Placeholder for footer content</p> </div> Here is the css for the sticky footer and the background image: #body-outer { background: url(../_images/bg_body.jpg) no-repeat center top; height: 100%; } body { width: 100%; background: url(../_images/bg_html.jpg) repeat-x left top; } #container { width: 960px; margin: 0 auto; } html, body, #container { height: 100%; } body > #container { height: auto; min-height: 100%; padding-bottom: 140px; } #main { padding-bottom: 0; } #footer { position: relative; width: 100%; background-color: #4e8997; margin-top: ; /* negative value of footer height */ height: 140px; clear:both; } .clearfix:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; } .clearfix {display: inline-block;} * html .clearfix { height: 1%;} Any assistance in sorting this out would be greatly appreciated. thanks.

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  • Set default form textfield value (webbrowser control)

    - by Khou
    Hi I would like my application to load a webpage and set default the form textfield value a predefine value. Requirements: -The application is a windows form, it is to use the web browser control, to load a web page. -Textfield values are define by within the application. -When textfield on the webpage matches the applications predefined elements, the predefine fixed value is set and can not be changed by the end user. Example If my application defines element "FirstName" equal to value "John", the text field for value for element "FirstName" will always equal "John" and this value can not be changed by the end user. Below is html/javascript code to perform this functionality, now how do I implement this in a windows form? (without having to modify the loaded webpage source code (if possible). HTML <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>page title</title> <script script type="text/javascript" src="demo1.js"></script> </head> <body onload="def(document.someform, 'name', 'my default name value');"> <h2 style="color: #8e9182">test form title</h2> <form name="someform" id="someform_frm" action="#"> <table cellspacing="1"> <tr><td><label for="name">NameX: </label></td><td><input type="text" size="30" maxlength="155" name="name" onchange="def(document.someform, 'name', 'my default name value');"></td></tr> <tr><td><label for="name2">NameY: </label></td><td><input type="text" size="30" maxlength="155" name="name2"></td></tr> <tr><td colspan="2"><input type="button" name="submit" value="Submit" onclick="showFormData(this.form);" ></td></table> </form> </body> </html> JAVASCRIPT function def(oForm, element_name, def_txt) { oForm.elements[element_name].value = def_txt; }

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  • ClassCastException when casting custom View subclass

    - by Jens Jacob
    Hi I've run into an early problem with developing for android. I've made my own custom View (which works well). In the beginning i just added it to the layout programmatically, but i figured i could try putting it into the XML layout instead (for consistency). So what i got is this: main.xml: [...] <sailmeter.gui.CompassView android:id="@+id/compassview1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/widget55" android:background="@color/white" /> [...] CompassView.java: public class CompassView extends View { } SailMeter.java (activity class): public class SailMeter extends Activity implements PropertyChangeListener { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); compassview = (CompassView) findViewById(R.id.compassview1); [...] } } (Theres obviously more, but you get the point) Now, this is the stacktrace: 05-23 16:32:01.991: ERROR/AndroidRuntime(10742): Uncaught handler: thread main exiting due to uncaught exception 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): java.lang.RuntimeException: Unable to start activity ComponentInfo{sailmeter.gui/sailmeter.gui.SailMeter}: java.lang.ClassCastException: android.view.View 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.ActivityThread.access$2200(ActivityThread.java:126) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.os.Handler.dispatchMessage(Handler.java:99) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.os.Looper.loop(Looper.java:123) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.ActivityThread.main(ActivityThread.java:4595) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at java.lang.reflect.Method.invoke(Method.java:521) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at dalvik.system.NativeStart.main(Native Method) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): Caused by: java.lang.ClassCastException: android.view.View 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at sailmeter.gui.SailMeter.onCreate(SailMeter.java:51) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) 05-23 16:32:02.051: ERROR/AndroidRuntime(10742): ... 11 more Why cant i cast my custom view? I need it to be that type since it has a few extra methods in it that i want to access. Should i restructure it and have another class handle the logic, and then just having the view being a view? Thanks for any help.

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  • h:dataTable alternating rows in JSF2

    - by Benchik
    Hello. I'm trying to make alternating rows in JSF2 h:dataTable (no richfaces or such) but i get an unexpected result. the table is built but it has a white grid shown (but i didn't specifiy any border) and there's no buttom line under each row. The CSS: .order-table{ border-collapse:collapse; } .order-table-header{ text-align:center; background:none repeat scroll 0 0 #E5E5E5; border-bottom:1px solid #95bce2; padding:16px; } .order-table-odd-row{ text-align:center; background:none repeat scroll 0 0 #FFFFFFF; border-top:1px solid #000000; } .order-table-even-row{ text-align:center; background:none repeat scroll 0 0 #ecf6fc; border-top:1px solid #BBBBBB; } table.order-table tr.over { background-color: #bcd4ec; } The table: <h:dataTable id="personsTable" value="#{personController.allPersons}" var="bean" styleClass="order-table" headerClass="order-table-header" rowClasses="order-table-odd-row,order-table-even-row"> <h:column> <f:facet name="header"> <h:outputText value="First Name" /> </f:facet> <h:outputText value="#{bean.firstName}"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Last Name" /> </f:facet> <h:outputText value="#{bean.lastName}"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Phone" /> </f:facet> <h:outputText value="#{bean.phone}"/> </h:column> </h:dataTable> and a small JQuery script: <script type="text/javascript"> $(document).ready(function(){ $(".order-table tr").mouseover(function(){ $(this).addClass("over"); }); $(".order-table tr").mouseout(function(){ $(this).removeClass("over"); }); }); </script> The result is (notice the white grid that came from i don't know where. And also no underline which should come from the CSS): http://imagebin.org/132574

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  • point light illumination using Phong model

    - by Myx
    Hello: I wish to render a scene that contains one box and a point light source using the Phong illumination scheme. The following are the relevant code snippets for my calculation: R3Rgb Phong(R3Scene *scene, R3Ray *ray, R3Intersection *intersection) { R3Rgb radiance; if(intersection->hit == 0) { radiance = scene->background; return radiance; } ... // obtain ambient term ... // this is zero for my test // obtain emissive term ... // this is also zero for my test // for each light in the scene, obtain calculate the diffuse and specular terms R3Rgb intensity_diffuse(0,0,0,1); R3Rgb intensity_specular(0,0,0,1); for(unsigned int i = 0; i < scene->lights.size(); i++) { R3Light *light = scene->Light(i); R3Rgb light_color = LightIntensity(scene->Light(i), intersection->position); R3Vector light_vector = -LightDirection(scene->Light(i), intersection->position); // check if the light is "behind" the surface normal if(normal.Dot(light_vector)<=0) continue; // calculate diffuse reflection if(!Kd.IsBlack()) intensity_diffuse += Kd*normal.Dot(light_vector)*light_color; if(Ks.IsBlack()) continue; // calculate specular reflection ... // this I believe to be irrelevant for the particular test I'm doing } radiance = intensity_diffuse; return radiance; } R3Rgb LightIntensity(R3Light *light, R3Point position) { R3Rgb light_intensity; double distance; double denominator; if(light->type != R3_DIRECTIONAL_LIGHT) { distance = (position-light->position).Length(); denominator = light->constant_attenuation + (light->linear_attenuation*distance) + (light->quadratic_attenuation*distance*distance); } switch(light->type) { ... case R3_POINT_LIGHT: light_intensity = light->color/denominator; break; ... } return light_intensity; } R3Vector LightDirection(R3Light *light, R3Point position) { R3Vector light_direction; switch(light->type) { ... case R3_POINT_LIGHT: light_direction = position - light->position; break; ... } light_direction.Normalize(); return light_direction; } I believe that the error must be somewhere in either LightDirection(...) or LightIntensity(...) functions because when I run my code using a directional light source, I obtain the desired rendered image (thus this leads me to believe that the Phong illumination equation is correct). Also, in Phong(...), when I computed the intensity_diffuse and while debugging, I divided light_color by 10, I was obtaining a resulting image that looked more like what I need. Am I calculating the light_color correctly? Thanks.

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  • Flex: Create custom stroke on LineSeries?

    - by John Isaacks
    You can easily set a stroke on a line series like this: <mx:LineSeries yField="apple"> <mx:lineStroke> <mx:Stroke color="0x6699FF" weight="4" alpha=".8" /> </mx:lineStroke> </mx:LineSeries> This will set alpha for the entire stroke to .8 But I want to be able to set a different alpha on the stoke for each plot based on something in the dataProvider. For example the yField in the lineSeries is "Apple" which is how it knows where to plot for the lineSeries. I want to be able to add something like alphaField which tells it what to set the stroke alpha for each plot. so if my dataProvider was: <result month="Jan-04"> <apple>81768</apple> <alpha>1</alpha> </result> <result month="Feb-04"> <apple>51156</apple> <alpha>1</alpha> </result> <result month="Mar-04"> <apple>51156</apple> <alpha>.5</alpha> </result> And I set alphaField="alpha" then I would have a solid stroke from plot 0 to plot 1 and then a 50% alpha stroke from plot 1 to plot 2. How can I do this??? I am looking in the commitProperties() and updateDisplayList() methods of LineSeries and have no idea what would need to be added/changed to make this? I am pretty sure, this class has to use Graphics.lineTo() to draw each plot, so basically it would need to "get" the current alphaField value somehow, and apply a Graphics.lineStyle() with the correct alpha before drawing each line. Thanks!! UPDATE I have gotten much closer to my answer. When I extend LineRenderer I override updateDisplayList() which calls GraphicsUtilities.drawPolyLine() I extend GraphicsUtilities and override the method drawPolyLine() as this is where the line is actually drawn. I can call lineStyle() in here and change the alpha of the line... I still have 1 thing I cannot figure out, from within the drawPolyLine() method how can I access that data that dictates what the alpha should be? Thanks!!!!

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  • Problem in vertical navigation menu using css sprites

    - by ShiVik
    Hello all I am trying to create to a vertical navigation menu using CSS sprites. I want to put in it a hover effect where the menu option slides out a bit. a:link { background: url(images/nav.png); background-position: -100px 0px; width: 150px; } a:hover { background: url(images/nav.png); background-position: -100px 0px; width: 160px; } So I am using the same image, I am just increasing its size to create a pop out effect. But my problem is that right now the image's size is increasing to the right. I want to keep the image's base aligned and its head should pop out. Here's my complete css code: #navmenu { left: 100px; margin: 0; padding: 0; position: absolute; top: 150px; width: 150px; z-index: 99; } #navmenu ul { list-style-type: none; margin: 0px; padding: 0px; } #navmenu ul li { line-height: 1.5em; padding: 0px; } #navimenu ul li a { color: black; display: block; font-weight: bold; height: 26px; padding: 0px 15px 0px 0px; text-align: right; width: 150px; } #navmenu a:link, #navmenu a:visited { background: url(images/nav.png) no-repeat; background-position: -150px 0px; width: 150px; } #navmenu a:hover { background: url(images/nav.png) no-repeat; background-position: -150px 0px; width: 160px; } Don't know how much if I've put the problem correctly but can somebody help me out here? Thanks

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  • PriorityQueue update problems

    - by Bharat
    After going through a bunch of questions here on SO, I still have no idea what exactly is going wrong with my code and would appreciate some help. I'm trying to implement a priority queue based on f-costs for an A* algorithm, and while the algorithm works fine for short pathfinding distances, it seems to go wrong when there's an obstacle or when the distance between start and goal points is greater than about 30 squares (although sometimes it screws up for less too). while(!m_qOpenList.isEmpty()) { m_xCurrent=m_qOpenList.poll(); m_xCurrent.setBackground(Color.red); m_qClosedList.add(m_xCurrent); if(m_xCurrent.getStatus()==2) { System.out.println("Target Reached"); solved=true; break; } iX=m_xCurrent.getXCo(); iY=m_xCurrent.getYCo(); for(i=iX-1;i<=iX+1;i++) for(j=iY-1;j<=iY+1;j++) { if(i<0||j<0||i>m_iMazeX||j>m_iMazeX||(i==iX&&j==iY) || m_xNode[i][j].getStatus()==4|| m_qClosedList.contains(m_xNode[i][j])) continue; m_xNode[i][j].score(m_xCurrent,m_xGoal); m_qOpenList.add(m_xNode[i][j]); } } It's quite rudimentary as I'm just trying to get it to work for now. m_qOpenList is the PriorityQueue. The problem is that when I debug the program, at some point (near an obstacle), a Node with a fcost of say 84 has higher priority than a node with an fcost of 70. I am not attempting to modify the values once they're on the priority queue. You'll notice that I add at the end of the while loop (I read somewhere that the priorityqueue reorders itself when stuff is added to it), and poll right after that at the beginning. Status of 2 means the Node is the goal, and a status of 4 means that it is unwalkable. public int compareTo(Node o) { if(m_iF<o.m_iF) return -1; if(m_iF>o.m_iF) return 1; return 0; } And that's the compareTo function. Can you see a problem? =(

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  • How would you organize a large complex web application (see basic example)?

    - by Anurag
    How do you usually organize complex web applications that are extremely rich on the client side. I have created a contrived example to indicate the kind of mess it's easy to get into if things are not managed well for big apps. Feel free to modify/extend this example as you wish - http://jsfiddle.net/NHyLC/1/ The example basically mirrors part of the comment posting on SO, and follows the following rules: Must have 15 characters minimum, after multiple spaces are trimmed out to one. If Add Comment is clicked, but the size is less than 15 after removing multiple spaces, then show a popup with the error. Indicate amount of characters remaining and summarize with color coding. Gray indicates a small comment, brown indicates a medium comment, orange a large comment, and red a comment overflow. One comment can only be submitted every 15 seconds. If comment is submitted too soon, show a popup with appropriate error message. A couple of issues I noticed with this example. This should ideally be a widget or some sort of packaged functionality. Things like a comment per 15 seconds, and minimum 15 character comment belong to some application wide policies rather than being embedded inside each widget. Too many hard-coded values. No code organization. Model, Views, Controllers are all bundled together. Not that MVC is the only approach for organizing rich client side web applications, but there is none in this example. How would you go about cleaning this up? Applying a little MVC/MVP along the way? Here's some of the relevant functions, but it will make more sense if you saw the entire code on jsfiddle: /** * Handle comment change. * Update character count. * Indicate progress */ function handleCommentUpdate(comment) { var status = $('.comment-status'); status.text(getStatusText(comment)); status.removeClass('mild spicy hot sizzling'); status.addClass(getStatusClass(comment)); } /** * Is the comment valid for submission */ function commentSubmittable(comment) { var notTooSoon = !isTooSoon(); var notEmpty = !isEmpty(comment); var hasEnoughCharacters = !isTooShort(comment); return notTooSoon && notEmpty && hasEnoughCharacters; } // submit comment $('.add-comment').click(function() { var comment = $('.comment-box').val(); // submit comment, fake ajax call if(commentSubmittable(comment)) { .. } // show a popup if comment is mostly spaces if(isTooShort(comment)) { if(comment.length < 15) { // blink status message } else { popup("Comment must be at least 15 characters in length."); } } // show a popup is comment submitted too soon else if(isTooSoon()) { popup("Only 1 comment allowed per 15 seconds."); } });

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  • Cant full read querystring data in mvc4 application using a class array as input to action

    - by Anders Lindén
    I have made a mvc4 application and I have a Controller that outputs a png file like this: using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.Drawing.Text; using System.IO; using System.Web.Mvc; using Foobar.Classes; namespace Foobar.Controllers { public class ImageController : Controller { public ActionResult Index(Label[] labels) { var bmp = new Bitmap(400, 300); var pen = new Pen(Color.Black); var font = new Font("arial", 20); var g = Graphics.FromImage(bmp); g.SmoothingMode = SmoothingMode.HighQuality; g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit; if (labels != null) { g.DrawString("" + labels.Length, font, pen.Brush, 20, 20); if (labels.Length > 0) { g.DrawString("" + labels[0].label, font, pen.Brush, 20, 40); } } var stream = new MemoryStream(); bmp.Save(stream, ImageFormat.Png); stream.Position = 0; return File(stream, "image/png"); } } } The Label class looks like this: using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace Foobar.Classes { public class Label { public string label { get; set; } public int fontsize { get; set; } } } When I run my controller having this in the url: http://localhost:57775/image?labels[0][label]=Text+rad+1&labels[0][fontsize]=5&labels[1][fontsize]=5&labels[2][fontsize]=5 I get the correct amount of labels, so the image will show 3. But the instances of Label will not get its data members fill in. I have also tried to do this using plain variables (not properties). If they were filled in, the image would actually show "3" and "Text rad 1". So what do I put in the class "Label" to have the properties right? Should there be some kind of annotation? Where do I read about this?

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  • hyperLink on jsf error messages problem

    - by user234194
    I am trying to put link in the error messages produced by JSF. For this I am using the custom renderer, it works(clicking the error, focuses the respective input field) but the problem is , all the form values gets empty. ie when error occurs, all the input fields get empty. Any suggestion will be appreciated. package custom; public class CustomErrorRenderer extends Renderer { @Override @SuppressWarnings("unchecked") public void encodeEnd(FacesContext context, UIComponent component) throws IOException { ResponseWriter writer = context.getResponseWriter(); writer.startElement("div", component); writer.writeAttribute("id", component.getClientId(context), "id"); writer.writeAttribute("style", "color: red", null); writer.startElement("ul", null); Iterator clientIds = context.getClientIdsWithMessages(); while (clientIds.hasNext()) { String clientId = clientIds.next(); Iterator messages = context.getMessages(clientId); if (!messages.hasNext()) { continue; } String javaScript = "var field = document.getElementById('" + clientId + "');" + "if(field == null) return false;" + "field.focus(); return false;"; writer.startElement("li", null); writer.startElement("a", null); writer.writeAttribute("onclick", javaScript, null); writer.writeAttribute("href", "#", null); while (messages.hasNext()) { writer.writeText(messages.next().getSummary(), null); } writer.endElement("a"); writer.endElement("li"); } writer.endElement("ul"); writer.endElement("div"); } } This renderer is defined in faces-config.xml: add to base HTML_BASIC renderkit HTML_BASIC HTML_BASIC CustomErrorRenderer javax.faces.Output custom.CustomErrorRenderer custom.CustomErrorRenderer CustomErrorMessages custom.Errors javax.faces.component.UIOutput a tag class: package custom; import javax.faces.webapp.UIComponentELTag; public class CustomErrorTag extends UIComponentELTag { @Override public String getComponentType() { return "custom.Errors"; } @Override public String getRendererType() { return "custom.CustomErrorRenderer"; } } This is defined in a TLD file: http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1" 1.0 custom http://custom errors custom.CustomErrorTag empty This goes at the top of the JSP page: <%@ taglib prefix="custom" uri="http://custom"%

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  • Jquery Tools Overlay call on javascript function

    - by user342944
    Hi Guys, I have a jquery overlay window in my html alongwith a button to activate here is the code. <!-- Validation Overlay Box --> <div class="modal" id="yesno" style="top: 100px; left: 320px; position: relative; display: none; z-index: 0; margin-top: 100px;"> <h2> &nbsp;&nbsp;Authentication Failed</h2> <p style="font-family:Arial; font-size:small; text-align:center"> Ether your username or password has been entered incorrectly. Please make sure that your username or password entered correctly... </p> <!-- yes/no buttons --> <p align="center"> <button class="close"> OK </button> </p> </div> Here is the Jquery tools Script <SCRIPT> $(document).ready(function() { var triggers = $(".modalInput").overlay({ // some mask tweaks suitable for modal dialogs mask: { color: '#a2a2a2', loadSpeed: 200, opacity: 0.9 }, closeOnClick: false }); var buttons = $("#yesno button").click(function(e) { // get user input var yes = buttons.index(this) === 0; // do something with the answer triggers.eq(0).html("You clicked " + (yes ? "yes" : "no")); }); $("#prompt form").submit(function(e) { // close the overlay triggers.eq(1).overlay().close(); // get user input var input = $("input", this).val(); // do something with the answer triggers.eq(1).html(input); // do not submit the form return e.preventDefault(); }); }); And here how its called upon clicking on a button or a hyperlink "<BUTTON class="modalInput" rel="#yesno">You clicked no</BUTTON>" All i want is I dont want to show the overlay on clicking on button or through a link. Is it possible to call it through a javascript function like "showOverlay()" ??

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  • Three ways of ataching to events with dojo. What exactly is the difference?

    - by Mark
    Is the difference here just various syntactical sugars or is there a reason to use one approach over the other? They all work, and to be a little more confusing what is the difference between this and evt.currentTarget? the CSS #reportDetails table tr:hover td, #reportDetails table tr.hover td { background: #aae4e2; color: #333333; } Sample html <div id="reportDetails"> <table> <tr> <td> something</td> <td> soemthing else</td> </tr> <tr> <td> something2</td> <td> soemthing else2</td> </tr> </table> </div> dojo.behavior script dojo.require("dojo.behavior"); if (dojo.isIE <= 6) { dojo.behavior.add({ '#reportDetails tr': { onmouseover: function(evt){ dojo.addClass(evt.currentTarget, "hover");}, onmouseout: function(evt){dojo.removeClass(evt.currentTarget, "hover"); } } }); } dojo.behavior.apply(); dojo.query forEach script if (dojo.isIE <= 6) { dojo.addOnLoad(function() { dojo.query("tr", "reportDetails").forEach(function(node){ node.onmouseover=function(){dojo.addClass(node,"hover");} node.onmouseout=function() {dojo.removeClass(node,"hover");} } }); }); } dojo.query ataching straight to the events if (dojo.isIE <= 6) { dojo.addOnLoad(function(){ dojo.query("tr", "reportDetails") .onmouseover(function(evt){dojo.addClass(evt.currentTarget, "hover");}) .onmouseout(function(evt){dojo.removeClass(evt.currentTarget, "hover");}); }); } I am assuming that evt.currentTarget and node could all be replaced with this and still work. I believe there is no real difference between 2 and 3 but the first one might actually use a different approach.

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  • Dotted Border turns to solid if object is animated with jQuery.

    - by Serg Chernata
    I have a simple setup: an image and then a paragraph with a bit of info that is hidden and then slides up over the image on mouse hover. If I try to apply a border-top that is dashed or dotted onto the paragraph it simply turns into a solid line. Is this a known issue with a fix? I even tried adding the dotted border through jQuery and it still comes out as a solid line. <div class="wrap"> <img src="images/fillertxt.jpg" alt="image" /> <img src="images/filler.jpg" class="front" alt="image" /> <p class="info"> This is a short description with a bit of text. </p> </div> .wrap .info { width:204px; height:50px; background:url(images/infobg.jpg) repeat-x #8d9c0c; color:#f7f5ef; padding:3px; position:absolute; top:142px; left:0; border-top:3px dotted #8d9c0c; } $(document).ready(function(){ $("p.info").css("border-top","3px dotted #8d9c0c"); $(function(){ bindTypeOne(); $("input[type=radio]").click(function(){ if ($(this).attr("rel") == "type1"){ bindTypeOne(); } else if ($(this).attr("rel") == "type2"){ bindTypeTwo(); } }); }); function bindTypeOne() { $("div.wrap").hover(function(){ $(this).children("p.info").stop(); $(this).children(".front").stop().animate({"top":"141px"}, 400); },function(){ $(this).children("p.info").stop(); $(this).children(".front").stop().animate({"top":"0"}, 700); }); }; function bindTypeTwo() { $("div.wrap").hover(function(){ $(this).children(".front").stop(); $(this).children("p.info").stop().animate({"top":"80px","border-top":"3px dotted #8d9c0c"}, 400); },function(){ $(this).children(".front").stop(); $(this).children("p.info").stop().animate({"top":"142px"}, 700); }); }; });

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  • How do i rotate a CALayer around a diagonal axis?

    - by Mattias Wadman
    Hi, im trying to implement a flip animation to be used in board game like application. The animation is suppose to look like a game piece that rotate and change to the color of its back. I have managed to get a animation that flips around orthogonal axis, but when i try to flip around a diagonal axis by changing the rotation around the z-axis not surprisingly the actual image also gets rotated. Instead i would like to rotate the image as it is around a diagonal axis. I have tried to change layer.sublayerTransform but with no success. Here is the current implementation. It works by doing a trick to resolve the issue of getting a mirrored image at the end of the animation. The solution is to not actually rotate the layer 180 degrees, instead it rotates it 90 degrees, changes image and then rotates it back. + (void)flipLayer:(CALayer *)layer toImage:(CGImageRef)image withAngle:(double)angle { const float duration = 0.5f; CAKeyframeAnimation *diag = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"]; diag.duration = duration; diag.values = [NSArray arrayWithObjects: [NSNumber numberWithDouble:angle], [NSNumber numberWithDouble:0.0f], nil]; diag.keyTimes = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], [NSNumber numberWithDouble:1.0f], nil]; diag.calculationMode = kCAAnimationDiscrete; CAKeyframeAnimation *flip = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.y"]; flip.duration = duration; flip.values = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], [NSNumber numberWithDouble:M_PI / 2], [NSNumber numberWithDouble:0.0f], nil]; flip.keyTimes = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], [NSNumber numberWithDouble:0.5f], [NSNumber numberWithDouble:1.0f], nil]; flip.calculationMode = kCAAnimationLinear; CAKeyframeAnimation *replace = [CAKeyframeAnimation animationWithKeyPath:@"contents"]; replace.duration = duration / 2; replace.beginTime = duration / 2; replace.values = [NSArray arrayWithObjects:(id)image, nil]; replace.keyTimes = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], nil]; replace.calculationMode = kCAAnimationDiscrete; CAAnimationGroup *group = [CAAnimationGroup animation]; group.removedOnCompletion = NO; group.duration = duration; group.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; group.animations = [NSArray arrayWithObjects:diag, flip, replace, nil]; group.fillMode = kCAFillModeForwards; [layer addAnimation:group forKey:nil]; }

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  • Java Nimbus LAF with transparent text fields

    - by Software Monkey
    I have an application that uses disabled JTextFields in several places which are intended to be transparent - allowing the background to show through instead of the text field's normal background. When running the new Nimbus LAF these fields are opaque (despite setting setOpaque(false)), and my UI is broken. It's as if the LAF is ignoring the opaque property. Setting a background color explicitly is both difficult in several places, and less than optimal due to background images actually doesn't work - it still paints it's LAF default background over the top, leaving a border-like appearance (the splash screen below has the background explicitly set to match the image). Any ideas on how I can get Nimbus to not paint the background for a JTextField? Note: I need a JTextField, rather than a JLabel, because I need the thread-safe setText(), and wrapping capability. Note: My fallback position is to continue using the system LAF, but Nimbus does look substantially better. See example images below. Conclusions The surprise at this behavior is due to a misinterpretation of what setOpaque() is meant to do - from the Nimbus bug report: This is a problem the the orginal design of Swing and how it has been confusing for years. The issue is setOpaque(false) has had a side effect in exiting LAFs which is that of hiding the background which is not really what it is ment for. It is ment to say that the component my have transparent parts and swing should paint the parent component behind it. It's unfortunate that the Nimbus components also appear not to honor setBackground(null) which would otherwise be the recommended way to stop the background painting. Setting a fully transparent background seems unintuitive to me. In my opinion, setOpaque()/isOpaque() is a faulty public API choice which should have been only: public boolean isFullyOpaque(); I say this, because isOpaque()==true is a contract with Swing that the component subclass will take responsibility for painting it's entire background - which means the parent can skip painting that region if it wants (which is an important performance enhancement). Something external cannot directly change this contract (legitimately), whose fulfillment may be coded into the component. So the opacity of the component should not have been settable using setOpaque(). Instead something like setBackground(null) should cause many components to "no long have a background" and therefore become not fully opaque. By way of example, in an ideal world most components should have an isOpaque() that looks like this: public boolean isOpaque() { return (background!=null); }

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